Ascotel IntelliGate 2025/2045/2065
Part 4 Checking the installation 833
9 Checking the installation
Carefully check the following points to prevent any malfunctions.
Loop resistance of the analogue exchange line
1. Determine and record the loop resistance or attenuation.
2. Configure the attenuation of the analogue network interfaces (network card
TC-04AB) accordingly:
Attenuation≤ 2 dB or loop resistance R ≤ 280 Ω: "Short" or "Short D"
Attenuation> 2 dB or loop resistance R > 280 Ω: "Long" or "Long D"
S bus
• Have the terminating resistors been fitted to the last socket-outlet on the S
bus?
• Are the values for the resistors used correct? (100 Ω)
• Are all cable screens conductively connected to the PBX housing or the main
distribution board / patch panel?
Protective earth and equipotential bonding
• Does the installation comply with the earthing concept? (See "Earthing", page
720)
Checking for earth loops:
1. Disconnect the PBX from the 230 V mains and the USP where applicable.
2. Disconnect the earth connections (yellow / green) on the PBX and the main
distribution board / patch panel.
3. Connect the ohmmeter between the earthing terminal on the PBX or the
main distribution frame / patch panel and the building potential (see Fig.
4.93).
The resistance should be greater than 1 MΩ.
4. Remove the ohmmeter.
5. Reconnect the earth connections on the PBX.
6. Reconnect the PBX from the 230 V mains and the USP where applicable.
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